YZZGUV3050V20Wireless Bluetooth Headset

Wear the GUV3050 Headset GUV3050 Wireless Bluetooth Headset 2 1 Adjust the Headband 3 Headset Components Base Charging Point Bluetooth indicator switch Adjustable headband Volume up Volume down Multi - function button Power on/Power Busylight indicator Microphone USB charging port boom-arm Package contents GUV3050 Carry pouch USB cable BT dongle Quick User Guide Charging Base GUV3050 BT headset can be worn only on the right. Place the headset receiver to your ears. Adjust the headband until it is comfortable, ideally ensuring that there is virtually no pressure felt on the ears. To avoid low or distorted sound, and to provide clear and crisp telephone calls, the microphone should be positioned within 0.5 inches of your mouth. The microphone boom arm will move in a variety of directions to ensure the best fit. Charge the battery Option 1:The headset battery can be charged when connected to a PC using an USB cable (provided), or using any micro-USB charger (not provided). Option 2: Plug the charging base into a powered USB port and then dock the headset. Option 1 Option 2 Connect to mobile device (using Bluetooth) 1. Hold the On/off/connect switch in the connect position for 2 seconds until you hear the voice guided instruction. The Bluetooth indicator will flash blue. 2. Follow the voice guided instructions to connect. Connect to PC (using BT dongle) 1. Ensure the headset is switched on. 2. Plug the BT dongle into an USB port on your PC. The headset and BT dongle are already pre-connected. Connect the GUV3050 headset 456 Grandstream Networks, Inc. 126 Brookline Ave, 3rd Floor Boston, 02215 USA Voice: (617) 566-9300 Fax: (617) 249-1987 www. grandstream.com FCC ID: YZZGUV3050V20 Mute/unmute microphone How to use the HeadsetHow to manage multiple calls Headset on FUNCTIONACTION FUNCTIONACTION LED STATUS Slide the On switch Green Light flash twice in succession End current call and answer incoming call Tap the multi-function button Press and hold (2 secs) the Multi-function button Press and hold (2 secs) the Multi-function button Double-tap the Multi-function button Put current call on hold and answer incoming call Switch between held call and active call Reject incoming call, when on a call Red Light flash once in succession Blue Light flash Green Light flash twice and blue light flash once in succession Blue Light flash 1 time per 8 secs Slide the Off switch Slide the Pair Button Tap the Multi-function button Double-tap the Multi-function button Tap the volume up or volume down button Press and hold (2 secs) the volume down button Headset off Pairing Pairing Successfully Standby Answer/End Call Redial/ Reject Call Adjust Volume U.S. FCC Part 15 Regulatory Information This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: —Reorient or relocate the receiving antenna. —Increase the separation between the equipment and receiver. —Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. —Consult the dealer or an experienced radio/TV technician for help. Canada Regulatory Information This device complies with Innovation, Science, and Economic Development Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Certification information Common part This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. Le présent appareil est conforme aux CNR d' Innovation, Sciences et Développement économique Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil nedoit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélec- trique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement. The device is compliance with RF exposure guidelines, users can obtain Canadian information on RF exposure and compliance. Le présent appareil est conforme Après examen de ce matériel aux conformité ou aux limites d’intensité de champ RF , les utilisateurs peuvent sur l’exposition aux radiofréquences et la conformité and compliance d’acquérir les informations correspondantes. For Certification, Warranty and RMA information, please visit www.grandstream.com

Grandstream Networks, Inc. Address: 126 Brookline Ave, 3rd Floor Boston, MA 02215, USA Tel .: 1-617-5669300 Fax: 1-617-2491987 E-mail: [email protected] Date: 2021-03-05 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Dear Sir/Madam, We, Grandstream Networks, Inc. hereby authorize Shenzhen Accurate Technology Co., Ltd. to act as a laboratory for testing and test report generation for the following project(s): (Product descripti on: Wirel ess Bluetooth Headset, Model: GUV3050; FCC ID: YZZGUV3050V20) The chipset CSR8670 used in this device for US only supports Bluetooth BDR(GFSK), EDR(π/4-DQPSK, 8DPSK), other functions were disabled by software. We confirm that all information above is true, and we’ll be responsible for all the consequences. Please contact me if you have any question. Sincerely, Signature: Name: Ning Wei Tit le: Manager

Grandstream Networks, Inc. Address: 126 Brookline Ave, 3rd Floor Boston, MA 02215, USA Tel.: 1-617-5669300 Fax: 1-617-2491987 E-mail: [email protected] FCC Confidential Authorization Date: 2021-03-05 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request regarding application for certification of FCC ID: YZZGUV3050V20 In accordance with Sections 0.457 and 0.459 of the Commission’s Grandstream Networks, Inc. hereby requests long-term confidential treatment of information accompanying this application as outlined below: • Block Diagram • Schematics • Operation Description The above materials contain proprietary and confidential information not customarily released to the public. The public disclosure of these materials provides unjustified benefits to its competitors in the market. Sincerely Yours, Signature Name: Ning Wei Title: Manager

Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 1 of 7 External Photos All view of EUT Headset Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 2 of 7 Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 3 of 7 Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 4 of 7 Charging base Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 5 of 7 Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 6 of 7 Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 7 of 7

A A 9.89 12 12.6±0.1 A A 9.89 12 12.6±0.1 HVIN:GUV3050V2 CAN ICES-3(B)/NMB-3(B) IC:11964A-GUV3050V2 FCC ID: YZZGUV3050V20 Model: GUV3050Made in China HVIN:GUV3050V2 CAN ICES-3(B)/NMB-3(B) IC:11964A-GUV3050V2 FCC ID: YZZGUV3050V20 Model: GUV3050Made in China S/N XXXXXXXXXXXXXXXX P/N XXX-XXXXX-XXXXXX S/N XXXXXXXXXXXXXXXX P/N XXX-XXXXX-XXXXXX

Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 1 of 6 Internal photos Headset Antenna Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 2 of 6 Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 3 of 6 Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 4 of 6 Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 5 of 6 Charging base Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-RF Page 6 of 6

Note: This report may contain data that are not covered by the A2LA accreditation and are marked with an asterisk “★”. Shenzhen Accurate Technology Co., Ltd. is not responsible for the authenticity of any test data provided by the applicant. Data included from the applicant that may affect test results are marked with an asterisk ’*’. Customer model name, addresses, names, trademarks etc. are not considered data. This report cannot be reproduced except in full, without prior written approval of the Company. Unless otherwise stated the results shown in this test report refer only to the sample(s) tested. This report is valid only with a valid digital signature. The digital signature may be available only under the Adobe software above version 7.0. FCC PART 15.247 RSS-GEN ISSUE 5, FEBRUARY 2021 AMENDMENT 2 RSS-247, ISSUE 2, FEBRUARY 2017 TEST REPORT For Grandstream Networks, Inc. 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA FCC ID: YZZGUV3050V20 IC: 11964A-GUV3050V2 R e p o r t T y p e : O r i gi n a l R e p o r t P r o d u c t T y p e: W i r e l e s s Bl u e t o o t h H e a d s e t Report Number: RSZ210302001-00B Report Date: 2021-03-08 Reviewed By: Candy Li RF Engineer Prepared By: Shenzhen Accurate Technology Co., Ltd. 1/F., Building A, Changyuan New Material Port, Science & Industry Park, Nanshan District, Shenzhen, Guangdong, P.R. China Tel: (0755) 26503290 Fax: (0755) 26503396 Http://www.atc-lab.com Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-00B Page 2 of 61 TABLE OF CONTENTS GENERAL INFORMATION ....................................................................................................................................... 4 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ..................................................................................... 4 OBJECTIVE ................................................................................................................................................................... 4 TEST METHODOLOGY .................................................................................................................................................. 4 MEASUREMENT UNCERTAINTY .................................................................................................................................... 4 TEST FACILITY ............................................................................................................................................................. 5 SYSTEM TEST CONFIGURATION .......................................................................................................................... 6 DESCRIPTION OF TEST CONFIGURATION ...................................................................................................................... 6 EUT EXERCISE SOFTWARE .......................................................................................................................................... 6 SPECIAL ACCESSORIES ................................................................................................................................................. 6 EQUIPMENT MODIFICATIONS ....................................................................................................................................... 6 SUPPORT EQUIPMENT LIST AND DETAILS .................................................................................................................... 6 EXTERNAL I/O CABLE.................................................................................................................................................. 6 BLOCK DIAGRAM OF TEST SETUP ................................................................................................................................ 7 SUMMARY OF TEST RESULTS ............................................................................................................................... 8 TEST EQUIPMENT LIST ........................................................................................................................................... 9 FCC§15.247 (i), §1.1307 (b) (1) &§2.1093 – RF EXPOSURE .................................................................................. 10 APPLICABLE STANDARD ............................................................................................................................................ 10 TEST RESULT: ............................................................................................................................................................ 10 RSS-102 § 2.5.1 - EXEMPTION LIMITS FOR ROUTINE EVALUATION – SAR EVALUATION ................. 11 APPLICABLE STANDARD ............................................................................................................................................ 11 TEST RESULT: ............................................................................................................................................................ 12 FCC §15.203 & RSS-GEN §6.8 – ANTENNA REQUIREMENT ........................................................................... 13 APPLICABLE STANDARD ............................................................................................................................................ 13 ANTENNA CONNECTOR CONSTRUCTION .................................................................................................................... 13 FCC §15.207 (a) & RSS-GEN § 8.8 – AC LINE CONDUCTED EMISSIONS ...................................................... 14 APPLICABLE STANDARD ............................................................................................................................................ 14 EUT SETUP ................................................................................................................................................................ 14 EMI TEST RECEIVER SETUP ................................................................…

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Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-00B Page 1 of 2 Photo of Power Line Conducted Emission Measurement Photo of Radiated Emission Measurement (Below 1G) Shenzhen Accurate Technology Co., Ltd. Report No.: RSZ210302001-00B Page 2 of 2 Photo of Radiated Emission Measurement (Above 1G)